from flask import current_app, jsonify
from flask import request
from flask import session
from info.constants import CLICK_RANK_MAX_NEWS
from info.models import User, News, Category
from info.utils.response_code import RET
from . import index_blu
from flask import render_template


@index_blu.route("/news_list")
def news_list():
    """
    获取首页新闻数据
    :return:
    """
    # 1. 获取参数
    # 新闻的分类id
    cid = request.args.get("cid", "1")
    page = request.args.get("page", "1")
    per_page = request.args.get("per_page", "10")

    # 2. 校验参数
    try:
        # page 如果是哈哈就会报错 所以try
        page = int(page)
        cid = int(cid)
        per_page = int(per_page)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg="参数")

    filters = []
    if cid != 1:   # 查询的不是最新的数据
        # 需要添加条件
        filters.append(News.category_id == cid)

    # 3. 查询数据
    try:
        paginate = News.query.filter(*filters).order_by(News.create_time.desc()).paginate(page, per_page, False)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(RET.DBERR, errmsg="数据查询失败")
    # 取到当前页数据
    new_list = paginate.items
    total_page = paginate.pages
    current_page = paginate.page
    # 取页数
    # paginate.page
    # 取总页数
    # paginate.pages
    # 取当前页的数据
    # paginate.items

    # 将对象模型列表转换为字典列表
    news_dict_li = []
    for news in new_list:
        news_dict_li.append(news.to_basic_dict())

    data = {
        "total_page": total_page,
        "current_page": current_page,
        "news_dict_li": news_dict_li
    }

    return jsonify(errno=RET.OK, errmsg="OK", data=data)




@index_blu.route("/")
def index():
    """
    显示首页
    1. 如果用户已经登录， 将当前登陆的用户数据传到模板中 供模板显示
    :return:
    """
    # 显示用户是否登陆逻辑
    user_id = session.get("user_id", None)
    user = None
    if user_id:
        try:
            user = User.query.get(user_id)
        except Exception as e:
            current_app.logger.error(e)

    # 右侧新闻排行的逻辑
    try:
        new_list = News.query.order_by(News.clicks.desc()).limit(CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 定义一个空字典
    news_dict_li = []
    # 遍历对象列表 将对象的字典添加到列表中
    for news in new_list:
        news_dict_li.append(news.to_basic_dict())

    # 查询分类数据  通过模板形式渲染出来
    categores = Category.query.all()

    category_li = []
    for category in categores:
        category_li.append(category.to_dict())

    data = {
        "user": user.to_dict() if user else None,
        "news_dict_li": news_dict_li,
        "category_li": category_li
    }
    return render_template("news/index.html", data=data)


# 在打开网页时 浏览器会默认去请求根路径+favicon作网站标签的小图标
@index_blu.route("/favicon.ico")
def favicon():
    return current_app.send_static_file("news/favicon.ico")
